This is the 219th most frequent Bulgarian word.
интерес
Interest.
In this sentence, "интерес" refers to a personal interest or curiosity in a particular subject.
Той има интерес към историята.
He has an interest in history.
Here, "интерес" describes a financial or commercial interest in an endeavor.
Фирмата показва финансов интерес към новия проект.
The company shows financial interest in the new project.
In this usage, "интерес" conveys the benefit or welfare of the public.